Under-water exhaust and muffler.



` W. F. HALL. UNDER WATER EXHAUST AND MUFFLER. APPLIUATION FILED uns, 1912.v

I l UNITED STATES PATENT OFFICE.

WESLEY F. HALL, F LYNN, MASSACHUSETTS.

UNDER-WATER EXHAUST AND MUFFLER.

To all whom t may concern:

Be it known that I, VVEsLEY F. HALL, of Lynn, in the county of Essex and State of Massachusetts, have invented certain new' and useful Improvements 1n Under-VVater Exhausts and Mufflers, of which the following is a specication.

My invention has reference to improvements in under-water exhausts and mufllers.

The objects of my invention are to provide a simple and etlicient under-water ex* haust and muffler which is particularly adapted for use in connect-ion with marine engines of the explosion, expansion or similar types, by which the exhaust may be effectively muftled and discharged; and which prevents the exhaust from thumping the hull of the boat.

Other objects of the invention will appear from the following description..

The invention consists in such novel features of construction and combinations of parts as shall hereinafter be fully described and pointed out in the claims.

Referring to the drawings Figure 1 represents a side elevation of an exhaust and muffler, embodying my invention, attached to the hull of a boat, the portion of the hull shown being in section. Fig. 2 represents an end elevation of the same, with ythe portion of the hull shown in section.

Fig. 3 represents a top plan view of the exhaust and mulller. Fig. 4 represents a sectional view on the line 4 4 of Fig. 1. Fig. 5 represents a sectional view on the line 5 5 of Fig. 1, part of which is broken away to save space. Fig. 6 represents a sectional view on the line 6 6 of Fig. 1. Fig. 7 represents a sectional view on the line 7 7 of Fig. 1. Fig. 8 represents a sectional view on the line 8 8 of Fig. 3.

Like numbers of reference designate cor responding parts throughout.

The preferred form of my invention may be made in one casting, having an elongated base plate 10 which is positioned longitudinally or fore and aft on the bottom of the boat hull 11 and secured thereto in any suitable manner, e. g., by bolts and nuts 12. Projecting from the top and centrally located near the forward end of said base plate is a vertical pipe 13, which extends throng-h the hull 11. The upper en d of said pipe is internally threaded, so that 1t may be connected to the. discharge pipe of the engine in a mannerwell known to those skilled i Specification of Letters Patent. Patented Aug, 12,1913, Appncation inea Aprn a, 1912. serial4 No. 688,266. l

in the art. Extending through, and downwardly and rearwardly from said base plate is a passage 14 which is a continuation of the passage in the pipe 13. The passage 14 leads into a comparatively wide and low horizontal passage 15. The rear wall of said latter passage has vertical openings 16 which are alternately of the shape of an upright and inverted U. Continuations of said openings are elongated horizontal' passages 17, which for a portion 17a`of their length in cross section are of the same shape and size as said openings. Each inverted U- shaped passage is bounded by side walls 18 and al top wall 19 which are integral, there being no bottom wall. Each upright U- shaped passage 17 is bounded by the side walls 18 and a bottom wall 20 which are also integral, and said passages open at their top into a wat-er passage 25, hereinafter described. From the foregoing and in Figs. 6 and 7, it is shown that the walls of the passage17 are integral and are in the form of a corrugated plate, each passage forming a corru ation. The outer walls of each of the outsi e passages extend uprightly to the under surface of the base plate 10. The rear edges 21 of said walls extend rearwardly and upwardly from the under sides of the portions 17EL of said passage to the under surface of the base plate 10, and in the same inclined plane, the rear edges 22 of theremaining passages extend from the under side of the portions 17a to the top wall of said passages. 4

Adjacent to the starboard and port sides of the walls ofthe passage 14, are passages 23 and 24, respectively, the` forward endsV of which are open. Said latter passages lead into the comparatively low passage 25, of which the top wall is a portion of the base plate 10, and the vertical side walls are the continuations of the two outer vertical side walls of the passages 17. The rear end of the passage 25 is open.

By the forward lmovement of the boat, a continuousV stream of water is forced through each of the passages 23 and 24 which join into a single stream in the passage 25. .Said stream continues moving from the rear opening of the passage 25 toward the rear end of the boat. The rapidity of said stream and the distance it moves from the passage 25 towardsaid end of the boat varies in proportion to the speed of said boat. The discharge from the exhaust pipe of (he engine passes through the pipe 13, the passage 14, the passage 15, and the openings 1G, into the U-shaped discharge pas-- sages 1T. A small portion of the discharge in the upright U-shaped passages will enter the stream in the passage 25, and the remainder will pass through the rear openings in said upright U-shaped passages. The portion of the discharge which enters the passage will vary with the speed of the boat. A portion of the discharge in the inverted U-shaped passages will pass into the water below said passages and the remainder will pass out through the rear openings in said passages. The portion of the discharge which will pass into the water below said passages will vary with the speed of the boat. The stream of water, which passes through the passage 25 and continues moving toward the rear end of the boat, forms a barrier to prevent the discharge from thumping the hull of the boat. The movement of the boat will tend to prevent water from entering the passages 17, so that the discharge will have a substantially free passage therein.

It is evident from the foregoing that the discharge enters the water through several different openings and in several different directions; this is an important feature of my invention, for the reason that in underwater exhausts heretofore invented, as far as I am aware, the discharge enters the water in one volume, and there is nothing (o prevent it from thumping the hull of the boat, which causes considerable vibration and noise.

Having thus described my invention I claim as new and desire to secure by Letters Patent z- 1. In an under-water exhaust and muffler (he combination of a discharge passage with a water passagelocated above said discharge passage.

2. In an under-water exhaust and mufller the combination of a rearwardly and upwardly opening discharge passage with a water passage located above said discharge passage.

3. In an under-water exhaust and muiller the combination of a rearwardly and downwardly opening| discharge passage with a water passage located above said discharge passage.

4. In an under-water exhaust and muliler the combination of a rearwardly, upwardly and downwardly opening discharge passage with a water passage located above said discharge passage.

5. In an under-water exhaust and muller the combination of a plurality of discharge passages with a water passage located above said discharge passages.

6. In an under-water exhaust and muiiler the combination of a plurality of rearwardly and upwardly opening discharge passages with a Water passage located above said discharge passages.

7. In an under-water exhaust and mulller the combination of a plurality of rearwardly and downwardly opening discharge passages with a water passage located above said discharge passages.

8. In an under-water exhaust and muffler the combination of a plurality of rearwardly, upwardly and downwardly opening discharge passages with a water passage located above said discharge passages.

9. On under-Water exhaust and mulier comprising a base plate which is adapted to be attached to the hull of a boat, a vertically extending pipe projecting from said base plate, a passage connecting the passage in said pipe to a comparatively wide and low horizontal passage, and a plurality of discharge passages leading from said horizontal passage.

10. In an under-water exhaust and muller the combination of a base plate which is adapted to be attached to the hull of a boat, a vertically extending pipe projecting from said base plate, a passage connecting the passage in said pipe with a comparatively low and horizontal passage, a plurality of discharge openings in the rear wall of said horizontal passage, with a water passage located above said horizontal passage.

11. An under-water exhaust and mulller made in one casting, comprising a base plate which is adapted to be attached to the hull of a boat, a vertically extending pipe projecting from said base plate, which is adapted to be attached to the exhaust pipe of the engine, a downwardly and rearwardly extending passage which leads from the passage in said pipe to a comparatively wide and low horizontal passage, a plurality of inverted U-shaped discharge passages and a plurality of upright U-shaped discharge passages leading from said horizontal passage, said inverted U-shaped passages opening rearwardly and downwardly, and said upright U-shaped passages opening rearwardly and upwardly.

12. An under-water exhaust and muler comprising a base plate, a vertically extending pipe projecting from said base plate, a downwardly and rearwardly extending passage leading from the passage in said pipe to a horizontal passage, a discharge passage or passages leading from said horizontal passage, a passage on the starboard and port sides of the walls'of said downwardly and rearwardly extending passage, having their forward ends open, and having their rear ends opening into a comparatively wide and low passage having its rear end open, said lateral passage located above said first-mentioned horizontal passage.

13. An under-water exhaust and mufler comprising a single casting provided with a base plate, a vertically extending pipe proj ecting from said base plate, a downwardly and rearwardly extending passage leading from the passage in said pipe to a comparatively wide and low horizontal passage, a.

plurality of horizontal discharge passages in the form of a corrugated plate leading from said horizontal passage, a passage on the starboard and port sides of the wall of said downwardly and rearwardly extending passage having their forward ends open and their rear ends opening into a comparatively wide and low horizontal passage which opens rearwardly, said latter passage 15 In testimony whereof I have ailxed my 20 signature, in presence of two witnesses.

WESLEY F. HALL.

Witnesses:

ARTHUR M. vHALL, FRED. A. AVERY. 4 

